SACE EMAX 2 NEW LOW VOLTAGE POWER C I RCUI T BRE AKERS TO ANS I C37 / UL 1066 / CSA STANDARDS
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— Accessories for circuit breakers
Interlocks and switching devices Mechanical interlocks These interlock systems enable various opening
and closing configurations to be obtained between two or three circuit-breakers. Four types of inter- lock configuration are available:
Types of interlock
Possible application
Logic
Circuit-breakers
Type A Excludes the possibility of having two circuit-breakers in the closed position at the same time.
Main line power supply and emergency power supply.
Available between circuit-breakers of
1
2
different sizes and with any fixed / withdrawable version
O
O
I
O
O
I
Type B Permits a pair of circuit-breakers to be closed if the third is open. The latter can only be closed when the pair is open.
Two power supplies from transformers and one emergency power supply.
Available between E2.2, E4.2 and E6.2 circuit- breakers and with any fixed / withdrawable version
1
2
3
O
O
O
I
O
O
O
O
I
I
O
I
O
I
O
Type C Permits two out of three circuit-breakers to be closed at the same time.
Two half-busbars can be powered by a single transformer (bus-tie closed) or by both at the same time (bus-tie open).
Available between E2.2, E4.2 and E6.2 circuit- breakers and with any fixed / withdrawable version
1
2
3
O
O
O
I
O
O
O
I
O
O
O
I
O
I
I
I
I
O
I
O
I
Type D Permits one out of three interlocked circuit-breakers to be closed.
Three power supplies on the same busbar that must not operate in parallel.
Available between E2.2, E4.2 and E6.2 circuit- breakers and with any fixed / withdrawable version
1
2
3
O
O
O
I
O
O
O
I
O
O
O
I
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